"""
Author: Michel Peltriaux
Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
Contact: michel.peltriaux@sgdnord.rlp.de
Created on: 02.12.20

"""
from dal import autocomplete
from django import forms
from django.contrib.auth.models import User
from django.contrib.gis import forms as gis_forms
from django.contrib.gis.geos import Polygon
from django.db import transaction
from django.urls import reverse
from django.utils.translation import gettext_lazy as _

from compensation.models import EcoAccountWithdraw, EcoAccount
from intervention.models import Intervention, Revocation
from konova.forms import BaseForm, BaseModalForm
from konova.models import Document
from konova.settings import DEFAULT_LAT, DEFAULT_LON, DEFAULT_ZOOM, ZB_GROUP, ETS_GROUP
from konova.utils.messenger import Messenger
from konova.utils.user_checks import in_group
from organisation.models import Organisation
from user.models import UserActionLogEntry, UserAction


class NewInterventionForm(BaseForm):
    identifier = forms.CharField(
        label=_("Identifier"),
        label_suffix="",
        max_length=255,
        help_text=_("Generated automatically if none was given"),
        required=False,
    )
    title = forms.CharField(
        label=_("Title"),
        label_suffix="",
        max_length=255,
    )
    type = forms.CharField(
        label=_("Type"),
        label_suffix="",
        max_length=255,
        help_text=_("Which intervention type is this"),
    )
    law = forms.CharField(
        label=_("Law"),
        label_suffix="",
        max_length=255,
        help_text=_("Based on which law"),
    )
    handler = forms.CharField(
        label=_("Intervention handler"),
        label_suffix="",
        max_length=255,
        help_text=_("Who performs the intervention"),
    )
    data_provider = forms.ModelChoiceField(
        label=_("Data provider"),
        label_suffix="",
        help_text=_("Who provides the data for the intervention"),
        queryset=Organisation.objects.all(),
        widget=autocomplete.ModelSelect2(
            url="other-orgs-autocomplete",
            attrs={
                "data-placeholder": _("Organization"),
                "data-minimum-input-length": 3,
            }
        ),
    )
    data_provider_detail = forms.CharField(
        label=_("Data provider details"),
        label_suffix="",
        max_length=255,
        help_text=_("Further details"),
        required=False,
    )
    geometry = gis_forms.MultiPolygonField(
        widget=gis_forms.OSMWidget(
            attrs={
                "default_lat": DEFAULT_LAT,
                "default_lon": DEFAULT_LON,
                "default_zoom": DEFAULT_ZOOM,
                'map_width': 800,
                'map_height': 500
            },
        ),
        label=_("Map"),
        label_suffix="",
        help_text=_("Where does the intervention take place")
    )
    documents = forms.FileField(
        widget=forms.ClearableFileInput(
            attrs={
                "multiple": True,
            }
        ),
        label=_("Files"),
        label_suffix="",
        required=False,
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.form_title = _("New intervention")
        self.action_url = reverse("intervention:new")
        self.cancel_redirect = reverse("intervention:index")

    def save(self, user: User):
        with transaction.atomic():
            identifier = self.cleaned_data.get("identifier", None)
            title = self.cleaned_data.get("title", None)
            _type = self.cleaned_data.get("type", None)
            law = self.cleaned_data.get("law", None)
            handler = self.cleaned_data.get("handler", None)
            data_provider = self.cleaned_data.get("data_provider", None)
            data_provider_detail = self.cleaned_data.get("data_provider_detail", None)
            geometry = self.cleaned_data.get("geometry", Polygon())
            documents = self.cleaned_data.get("documents", []) or []

            action = UserActionLogEntry.objects.create(
                user=user,
                action=UserAction.CREATED,
            )
            intervention = Intervention(
                identifier=identifier,
                title=title,
                type=_type,
                law=law,
                handler=handler,
                data_provider=data_provider,
                data_provider_detail=data_provider_detail,
                geometry=geometry,
                created=action,
            )
            intervention.save()
            intervention.log.add(action)
        return intervention


class EditInterventionForm(NewInterventionForm):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if self.instance is not None:
            self.action_url = reverse("intervention:edit", args=(self.instance.id,))
        self.cancel_redirect = reverse("intervention:index")
        self.form_title = _("Edit intervention")
        self.form_caption = ""

        # Initialize form data
        form_data = {
            "identifier": self.instance.identifier,
            "title": self.instance.title,
            "type": self.instance.type,
            "law": self.instance.law,
            "handler": self.instance.handler,
            "data_provider": self.instance.data_provider,
            "data_provider_detail": self.instance.data_provider_detail,
            "geometry": self.instance.geometry,
            "documents": self.instance.documents.all(),
        }
        disabled_fields = [
            "identifier",
        ]
        self.load_initial_data(
            form_data,
            disabled_fields,
        )

    def save(self, user: User):
        """ Overwrite instance with new form data

        Args:
            user ():

        Returns:

        """
        with transaction.atomic():
            identifier = self.cleaned_data.get("identifier", None)
            title = self.cleaned_data.get("title", None)
            _type = self.cleaned_data.get("type", None)
            law = self.cleaned_data.get("law", None)
            handler = self.cleaned_data.get("handler", None)
            data_provider = self.cleaned_data.get("data_provider", None)
            data_provider_detail = self.cleaned_data.get("data_provider_detail", None)
            geometry = self.cleaned_data.get("geometry", Polygon())
            documents = self.cleaned_data.get("documents", []) or []

            self.instance.identifier = identifier
            self.instance.title = title
            self.instance.type = _type
            self.instance.law = law
            self.instance.handler = handler
            self.instance.data_provider = data_provider
            self.instance.data_provider_detail = data_provider_detail
            self.instance.geometry = geometry
            self.instance.save()

            user_action = UserActionLogEntry.objects.create(
                user=self.user,
                action=UserAction.EDITED
            )
            self.instance.log.add(user_action)

        return self.instance


class OpenInterventionForm(EditInterventionForm):
    """
    This form is not intended to be used as data-input form. It's used to simplify the rendering of intervention:open
    """
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Resize map
        self.fields["geometry"].widget.attrs["map_width"] = 500
        self.fields["geometry"].widget.attrs["map_height"] = 300

        # Disable all form fields
        for field in self.fields:
            self.disable_form_field(field)


class DummyFilterInput(forms.HiddenInput):
    """ A dummy input widget

    Does not render anything. Can be used to keep filter logic using django_filter without having a pre defined
    filter widget being rendered to the template.

    """
    template_name = "konova/custom_widgets/dummy-filter-input.html"


class TextToClipboardInput(forms.TextInput):
    template_name = "konova/custom_widgets/text-to-clipboard-input.html"


class ShareInterventionForm(BaseModalForm):
    url = forms.CharField(
        label=_("Share link"),
        label_suffix="",
        help_text=_("Send this link to users who you want to have writing access on the data"),
        required=False,
        widget=TextToClipboardInput(
            attrs={
                "readonly": True
            }
        )
    )
    users = forms.MultipleChoiceField(
        label=_("Shared with"),
        label_suffix="",
        required=True,
        help_text=_("Remove check to remove access for this user"),
        widget=forms.CheckboxSelectMultiple(
            attrs={
                "class": "list-unstyled",
            }
        ),
        choices=[]
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.form_title = _("Share")
        self.form_caption = _("Share settings for {}").format(self.instance.identifier)
        self.template = "modal/modal_form.html"

        # Make sure an access_token is set
        if self.instance.access_token is None:
            self.instance.generate_access_token()

        self._init_fields()

    def _init_fields(self):
        """ Wraps initializing of fields

        Returns:

        """
        # Initialize share_link field
        self.share_link = self.request.build_absolute_uri(
            reverse("intervention:share", args=(self.instance.id, self.instance.access_token,))
        )
        self.initialize_form_field(
            "url",
            self.share_link
        )

        # Initialize users field
        # Remove field if user is not in registration or conservation group
        if not in_group(self.request.user, ZB_GROUP) and not in_group(self.request.user, ETS_GROUP):
            del self.fields["users"]
        else:
            users = self.instance.users.all()
            choices = []
            for n in users:
                choices.append(
                    (n.id, n.username)
                )
            self.fields["users"].choices = choices
            u_ids = list(users.values_list("id", flat=True))
            self.initialize_form_field(
                "users",
                u_ids
            )

    def save(self):
        accessing_users = User.objects.filter(
            id__in=self.cleaned_data["users"]
        )
        self.instance.users.set(accessing_users)


class NewRevocationForm(BaseModalForm):
    date = forms.DateField(
        label=_("Date"),
        label_suffix=_(""),
        help_text=_("Date of revocation"),
        widget=forms.DateInput(
            attrs={
                "type": "date",
                "data-provide": "datepicker",
            },
            format="%d.%m.%Y"
        )
    )
    file = forms.FileField(
        label=_("Document"),
        label_suffix=_(""),
        help_text=_("Must be smaller than 15 Mb"),
        widget=forms.FileInput(
            attrs={
                "class": "w-75"
            }
        )
    )
    comment = forms.CharField(
        required=False,
        max_length=200,
        label=_("Comment"),
        label_suffix=_(""),
        help_text=_("Additional comment, maximum {} letters").format(200),
        widget=forms.Textarea(
            attrs={
                "cols": 30,
                "rows": 5,
            }
        )
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.form_title = _("Add revocation")
        self.form_caption = ""
        self.form_attrs = {
            "enctype": "multipart/form-data",  # important for file upload
        }

    def save(self):
        with transaction.atomic():
            created_action = UserActionLogEntry.objects.create(
                user=self.user,
                action=UserAction.CREATED
            )
            edited_action = UserActionLogEntry.objects.create(
                user=self.user,
                action=UserAction.EDITED
            )
            document = Document.objects.create(
                title="revocation_of_{}".format(self.instance.identifier),
                date_of_creation=self.cleaned_data["date"],
                comment=self.cleaned_data["comment"],
                file=self.cleaned_data["file"],
            )
            revocation = Revocation.objects.create(
                date=self.cleaned_data["date"],
                comment=self.cleaned_data["comment"],
                document=document,
                created=created_action,
            )
            self.instance.log.add(edited_action)
            self.instance.legal.revocation = revocation
            self.instance.legal.save()
        return revocation


class RunCheckForm(BaseModalForm):
    checked_intervention = forms.BooleanField(
        label=_("Checked intervention data"),
        label_suffix="",
        widget=forms.CheckboxInput(),
        required=True,
    )
    checked_comps = forms.BooleanField(
        label=_("Checked compensations data and payments"),
        label_suffix="",
        widget=forms.CheckboxInput(),
        required=True
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.form_title = _("Run check")
        self.form_caption = _("I, {} {}, confirm that all necessary control steps have been performed by myself.").format(self.user.first_name, self.user.last_name)

    def is_valid(self):
        super_result = super().is_valid()
        # Perform check
        msgs = self.instance.quality_check()
        for msg in msgs:
            self.add_error(
                "checked_intervention",
                msg
            )
        return super_result and (len(msgs) == 0)

    def save(self):
        with transaction.atomic():
            user_action = UserActionLogEntry.objects.create(
                user=self.user,
                action=UserAction.CHECKED
            )
            # Replace old checked
            if self.instance.checked:
                self.instance.checked.delete()
            self.instance.checked = user_action
            self.instance.log.add(user_action)
            self.instance.save()

        # Send message to the SSO server
        messenger = Messenger(
            self.instance.users.all(),
            type="INFO",
        )
        messenger.send_object_checked(
            self.instance.identifier,
            self.user,
        )


class NewWithdrawForm(BaseModalForm):
    """ Form for creating new withdraws

    Can be used for Intervention view as well as for EcoAccount views.

    Parameter 'instance' can be an intervention, as well as an ecoAccount.
    An instance check handles both workflows properly.

    """
    account = forms.ModelChoiceField(
        label=_("Eco-account"),
        label_suffix="",
        help_text=_("Only recorded accounts can be selected for withdraws"),
        queryset=EcoAccount.objects.filter(deleted=None),
        widget=autocomplete.ModelSelect2(
            url="accounts-autocomplete",
            attrs={
                "data-placeholder": _("Eco-account"),
                "data-minimum-input-length": 3,
                "readonly": True,
            }
        ),
    )
    surface = forms.DecimalField(
        min_value=0.00,
        decimal_places=2,
        label=_("Surface"),
        label_suffix="",
        help_text=_("in m²"),
    )
    intervention = forms.ModelChoiceField(
        label=_("Intervention"),
        label_suffix="",
        help_text=_("Only shared interventions can be selected"),
        queryset=Intervention.objects.filter(deleted=None),
        widget=autocomplete.ModelSelect2(
            url="interventions-autocomplete",
            attrs={
                "data-placeholder": _("Intervention"),
                "data-minimum-input-length": 3,
            }
        ),
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.form_title = _("New Withdraw")
        self.form_caption = _("Enter the information for a new withdraw from a chosen eco-account")
        self.is_intervention_initially = False

        # Add a placeholder for field 'surface' without having to define the whole widget above
        self.add_placeholder_for_field("surface", "0,00")

        # Check for Intervention or EcoAccount
        if isinstance(self.instance, Intervention):
            # Form has been called with a given intervention
            self.initialize_form_field("intervention", self.instance)
            self.disable_form_field("intervention")
            self.is_intervention_initially = True
        elif isinstance(self.instance, EcoAccount):
            # Form has been called with a given account --> make it initial in the form and read-only
            self.initialize_form_field("account", self.instance)
            self.disable_form_field("account")
        else:
            raise NotImplementedError

    def is_valid(self):
        """ Custom validity check

        Makes sure the withdraw can not contain more surface than the account still provides

        Returns:
            is_valid (bool)
        """
        super_result = super().is_valid()
        if self.is_intervention_initially:
            acc = self.cleaned_data["account"]
        else:
            acc = self.instance

        if not acc.recorded:
            self.add_error(
                "account",
                _("Eco-account {} is not recorded yet. You can only withdraw from recorded accounts.").format(acc.identifier)
            )
            return False

        # Calculate valid surface
        sum_surface = acc.get_surface()
        sum_surface_withdraws = acc.get_surface_withdraws()
        rest_surface = sum_surface - sum_surface_withdraws
        form_surface = float(self.cleaned_data["surface"])
        is_valid_surface = form_surface < rest_surface
        if not is_valid_surface:
            self.add_error(
                "surface",
                    _("The account {} has not enough surface for a withdraw of {} m². There are only {} m² left").format(acc.identifier, form_surface, rest_surface),
            )
        return is_valid_surface and super_result

    def save(self):
        with transaction.atomic():
            # Create log entry
            user_action_edit = UserActionLogEntry.objects.create(
                user=self.user,
                action=UserAction.EDITED
            )
            user_action_create = UserActionLogEntry.objects.create(
                user=self.user,
                action=UserAction.CREATED
            )
            self.instance.log.add(user_action_edit)

            # Create withdraw depending on Intervention or EcoAccount as the initial instance
            if self.is_intervention_initially:
                withdraw = EcoAccountWithdraw.objects.create(
                    intervention=self.instance,
                    account=self.cleaned_data["account"],
                    surface=self.cleaned_data["surface"],
                    created=user_action_create,
                )
            else:
                withdraw = EcoAccountWithdraw.objects.create(
                    intervention=self.cleaned_data["intervention"],
                    account=self.instance,
                    surface=self.cleaned_data["surface"],
                    created=user_action_create,
                )
        return withdraw